TP downloads entire Yahoo Mail account instead of only the past 7 days

[SentientByDesign]

This is getting REALLY agrivating.

Not only does my TP go into super snail mode, but my battery gets hot and drains quickly because the phone is trying to sync 2437 messages from my Yahoo Mail inbox. The earliest messages are from 06.

At first I checked the sync settings and even tried changing them to another number of days to see if that would work. No dice.

Then I took the phone back to sprint for this issue and another one and had them replace the phone. Still have the same problem.

Other than the actual email account, the only constant between both phones is that I used PIM to load up my contacts, messages, and calendar (still need to go through those text messages and deleted a few thousand).

Anybody have a solution for this problem? I'm thinking it's Yahoo that's causing the issue, but I'm not sure how or how to solve it. If I need to bump up my account from a free one to a Plus account, that's fine, but I'd like to get my email back on track.

BTW, this problem comes and goes. I initially thought it was only on weekends, but the problem surfaced today as well.